1. Real sharpening
2. Enhance visual acutance
http://en.wikipedia.org/wiki/Acutance
3. Local contrast enhancement (very usefull for black & white)
Refocus does 1, Unsharp mask does 2 and 3. I guess most people
actually want 2 and/or 3.
Let me give several remarks from user's point of view. I think that
problably (3) should be included in ufraw since it is quite easy using
unsharp mask (my experience for 8Mpx is that 50-100 radius and 0.1-0.15
amount in gimp units is usually enough). It also produces nice and
"user-friendly" effects.
Concerning sharpening - I almost never use sharpen on big pictures. Only
makes noise worse. So i suppose ufraw can stay without any sharpening
however possibility to apply slight sharpening would also be nice.
For final sharpening (after scaling down) I usually use plain "sharpen"
from gimp. works much better for me than USM. I doubt it would work ok for
full size pictures without modifications - something working on a bigger
scale/radius probably would be needed.
Best
Tomasz Golinski
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